Make it argue with you.
"Challenge every assumption in my thinking about [topic]. Push back hard on my logic, identify cognitive biases, and propose radically different perspectives."
ChatGPT agrees with you by default. This is the line that switches that off.
Paste your actual reasoning first, not just the topic. It can only attack what you show it.
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4. Ask five experts instead of one.
"Analyze my [idea/problem] from the perspective of 5 world-class experts in different fields, revealing insights I would miss from a single viewpoint."
You get five angles that disagree with each other rather than one smooth average.
Name the five fields yourself if the ones it picks all come from your own industry.
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5. Have it build the case against you.
"Create a compelling argument against my strongly held belief about [topic], using logic, evidence, and perspective shifts that challenge my thinking."
The point is not to change your mind.
It is to hear the strongest version of the other side before a customer, an investor or a boss says it to you first.